The flashing red light served as a ______ of danger ahead.

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问题 The flashing red light served as a ______ of danger ahead.

选项 A、predictor
B、caution
C、precaution
D、prevention

答案B

解析 (caution告诫，警告)。句意为：闪亮的红灯所起的作用是就前面的危险发出警告。A．predictor预言者；C．precaution预防，警惕；D．prevention预防，防止。

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考博英语

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